| Model Name |
ST-4200 |
ST-4400 |
ST-6400 |
| GS1 (EAN) CODE |
4260318511469 |
4260318511476 |
4260318511483 |
| System Type |
2-Channel Class D Amplifier |
4-Channel Class D Amplifier |
4-Channel Class D Amplifier |
Output Power
all channels driven
20Hz - 20 kHz, 0.1 % THD |
2 x 4000W @ 2Ohm
2 x 3000W @ 4Ohm
2 x 2000W @ 8Ohm |
4 x 2000W @ 2Ohm
4 x 1500W @ 4Ohm
4 x 1000W @ 8Ohm |
4 x 3000W @ 2Ohm
4 x 2250W @ 4Ohm
4 x 1500W @ 8Ohm |
Output Power
Bridge mode |
1 x 8000W @ 4Ohm
1 x 6000W @ 8Ohm |
2 x 4000W @ 4Ohm
2 x 3000W @ 8Ohm |
2 x 6000W @ 4Ohm
2 x 4500W @ 8Ohm |
| THD+N @ 8Ω 1kHz,1dB |
≤0.06% |
≤0.06% |
≤0.06% |
| Slew Rate |
>60v/μs |
>60v/μs |
>60v/μs |
Frequency Response
@1Watt, 8Ohm |
10Hz -34kHz / ±0.3dB |
10Hz -34kHz / ±0.3dB |
10Hz -34kHz / ±0.3dB |
Damping Factor
(1kHz and below) |
>450:1 |
>450:1 |
>450:1 |
Signal to Noise Ratio
20Hz -20 kHz |
>100dBA |
>100dBA |
>100dBA |
Channel Separation
Crosstalk@1kHz |
>70dB |
>70dB |
>70dB |
| Voltage Gain |
46dB (0,775V:153V) |
43dB (0,775V:108V) |
45dB (0,775V:134V) |
| Input Sensitivity |
selectable 0.775V/1V/1.5V/2V |
selectable 0.775V/1V/1.5V/2V |
selectable 0.775V/1V/1.5V/2V |
| Input Impedance |
30k Ohm Balanced
15k Ohm Unbalanced |
30k Ohm Balanced
15k Ohm Unbalanced |
30k Ohm Balanced
15k Ohm Unbalanced |
| Front Control |
Power switch, Gain control |
Power switch, Gain control |
Power switch, Gain control |
| Rear Control |
Sensitivity Switch,
Mode Switch |
Sensitivity Switch,
Mode Switch |
Sensitivity Switch,
Mode Switch |
| LED Indicators |
Signal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellow |
Signal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellow |
Signal -30dB / -10dB, green
Signal -4dB, yellow
Clip, orange
Protect, red
power, green
Bridge, yellow |
| Input Connectors |
XLR Active balanced
pin1 gnd / pin 2+ / pin3- |
XLR Active balanced
pin1 gnd / pin 2+ / pin3- |
XLR Active balanced
pin1 gnd / pin 2+ / pin3- |
| Output Connectors |
2 Neutrik NL4 Sockets
2 Binding Posts |
4 Neutrik NL4 Sockets |
4 Neutrik NL4 Sockets |
| Cooling |
Continuously Variable
speed fan |
Continuously Variable
speed fan |
Continuously Variable
speed fan |
| Protection |
Full short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loads |
Full short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loads |
Full short circuit, Open circuit,
thermal, Ultrasonic, RF Protection.
Stable Into reactive or
Mismatched loads |
| Load Protection |
On/Off muting
DC fault power
Supply shutdown |
On/Off muting
DC fault power
Supply shutdown |
On/Off muting
DC fault power
Supply shutdown |
| Operating Voltage |
220V (+/- 10%) 50-60Hz |
220V (+/- 10%) 50-60Hz |
220V (+/- 10%) 50-60Hz |
| Fuse |
T-25A |
T-20A |
T-25A |
| Dimensions (h/w/d) |
19“/2U 483W x 451D x 88H |
19“/2U 483W x 470D x 88H |
19“/2U 483W x 470D x 88H |
| Net weight |
22,5 kg |
23,0 kg |
25,5 kg |